Display screen for an object detector



FIG. 1 is a front view of a display screen for an object detector according to the design;

FIG. 2 is a front view of a second embodiment thereof;

FIG. 3 is a front view of a third embodiment thereof; and,

FIG. 4 is a front view of a fourth embodiment thereof.

The broken line drawing of the object detector in all views is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for an display screen for an object detector, as shown and described. 